Perhaps you should try some spelling variations:
petruoov » petrov (Expand Search), peteruoov (Expand Search), petruuoov (Expand Search), petrouoov (Expand Search)
petriv » peteriv (Expand Search), petruiv (Expand Search), petroiv (Expand Search)
petri » peteri (Expand Search), petrui (Expand Search), petroi (Expand Search)
petruiio » peteruiio (Expand Search), petruuiio (Expand Search), petrouiio (Expand Search)
petruuiu » peteruuiu (Expand Search), petruuuiu (Expand Search), petrouuiu (Expand Search)
petr » peter (Expand Search), petru (Expand Search), petro (Expand Search)

Try widening your search to All Fields.

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: fop ((petruoov OR (petriv OR peteriv)) OR (((petri OR petruiio) OR petruuiu) OR petr)) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((petruoov OR (petriv OR peteriv)) OR (((petri OR petruiio) OR petruuiu) OR petr)) o.s.".
• Adding a wildcard symbol may retrieve word variants: fop ((petruoov OR (petriv OR peteriv)) OR (((petri OR petruiio) OR petruuiu) OR petr)) o.s.*.